| 释义 |
swept, ppl. a.|swɛpt|
[pa. pple. of sweep v.]
1. In senses of the verb. Also with advs., as swept-out; swept-up: spec. of hair, brushed up towards the top of the head. Freq. as the second element of compounds, as air-swept, breeze-swept, bullet-swept, wind-swept.
1552Huloet, Swept howse, tersa domus. 1707Mortimer Husb. (1721) I. 346 Then he fills up the said swept place with Malt cast into a round from the sides. 1852Dickens Bleak Ho. v, Groping among the swept-out rubbish for pins and other refuse. 1893G. D. Leslie Lett. Marco i. 6 Piles of swept-up leaves. 1895M. Hewlett Earthwork Tuscany 12 Gas-lamps in swept streets flickered dirty yellow in the garish light. 1903Daily Chron. 28 May 7/3 A sword with a ‘swept’ hilt of large proportions. 1948‘J. Tey’ Franchise Affair xviii. 217 With her hair swept up and some make-up on, she would look quite different. 1959News Chron. 18 Aug. 6/7 Swept-up hair styles which straggle down the neck. 1973M. Woodhouse Blue Bone vi. 58 She was about five feet six, with butterfly glasses and swept-up hair.
2. Electronics. Of (the frequency of) a signal: increased (or decreased) through a range of values, usu. rapidly and repeatedly.
1965Wireless World Aug. 384/1 A random vibration testing technique which was similar to a swept sinewave frequency test except that the single frequency was replaced by a narrow band of noise. 1980IEEE Trans. Microwave Theory & Techniques XXVIII. 792/1 An automated swept-frequency absorption spectrometer.
3. Special collocations: swept-back a. Aeronaut., (of a wing) having its leading edge angled backwards (cf. sweepback s.v. sweep- 3 and delta wing s.v. delta 4); also transf.; swept valley Building [valley n. 4] (see quot. 1964); swept volume Mech., the volume through which a piston or plunger moves as it makes a stroke; swept wing Aeronaut., a swept-back wing; freq. attrib.; also as n., a swept-wing aircraft.
1914Aeroplane 26 Feb. 213/2 *Swept-back wings with negative tips must always have their centre of side pressure farther back relatively to their centre of lift than normal wings. 1951Engineering 20 Apr. 474/3 The third type of British swept-back ‘delta’-wing experimental aircraft. 1959Ibid. 16 Jan. 95/1 At each side of the column just below the engine are ‘swept back’ service ducts extending to the cell walls. 1976B. Jackson Flameout x. 169 Fast aircraft with swept-back wings are susceptible to dutch rolls.
1926G. Allen Smaller House of Today vi. 96 *Swept valleys are very suitable for slated and stone roofs. 1951N. Wymer Village Life iii. 64 A particularly unusual feature of the Cotswold roof is the ‘swept valley’. 1964J. S. Scott Dict. Building 326 Swept valley, a valley formed of shingles, slates, or tiles cut or made to a taper so as to eliminate the need for a flexible-metal valley. A tile-and-a-half tile is used and cut to shape so that its tail is narrower than its head.
1918W. E. Dommett Dict. Aircraft 45 *Swept Volume. The volume swept by the piston equals area of piston multiplied by the stroke. 1930Flight 24 Jan. 144/2 The engine is of the five-cylinder radial type of 150 cub. ins. swept volume. 1971B. Scharf Engin. & its Lang. xiii. 193 Volumetric efficiency. This is the ratio of the actual volume discharged [from a pump] (capacity) to the displacement or swept volume of the cylinder(s).
1947Jrnl. R. Aeronaut. Soc. LI. 15/2 Whether or not the delta wing is a better compromise than the *swept wing..must await the verdict of appropriate researches. 1955Times 25 June 6/2 The R.A.F.'s latest type of Hawker Hunter swept-wing fighter, the Mark IV, is being used for the first time. 1978A. Welch Bk. Airsports i. 9/2 In between are swallow-tails, swept-wings without tails and even the occasional biplane. |